JP2015021293A - External reinforcement type reinforcement method for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure reinforcement performance while improving construction efficiency.SOLUTION: A working hole part 22 which extends perpendicularly along one surface 14A of a side wall 14 buried in the ground is excavated so as to expose a plurality of places on the one surface 14A of the side wall 14 at intervals in an extending direction of the side wall 14. In the working hole part 22, a plurality of anchor reinforcing bars 26 are arranged at intervals from an upper end to a lower end of the one surface 14A to extend to inside the side wall 14 and outside the side wall 14 at the plurality of places. In the working hole part 22, a concrete form 32 is assembled to surround the plurality of anchor bars 26 and a column reinforcing bar 28 exposed to outside the side wall 14 respectively at the plurality of places. Concrete 34 is cast in each concrete form 32 so as to construct a reinforcement column 30 coupled integrally to the one surface 14A of the side wall 14 through the anchor bars 26 to the overall length of the side wall 14 in a height direction.

Description

  The present invention relates to a method for externally reinforcing a concrete structure.

A box culvert buried in the ground that constitutes an underground tunnel for railways or roadways is known.
It is requested to enhance the earthquake resistance of box culvert triggered by the Great Hanshin-Awaji Earthquake and the Tohoku-Pacific Ocean Earthquake.
In Cited Document 1, as a method of reinforcing the box culvert, a technique is proposed in which a shear reinforcing material is inserted into a hole formed from the inner wall surface side of the side wall of the box culvert toward the inside of the wall, and the remaining void is filled and solidified with a filler. Has been.

Patent No. 3932094

However, in the above prior art, a hole is formed from the inner wall surface side of the side wall of the box culvert toward the inside of the wall, a shear reinforcing material is inserted into the hole portion from the inner wall surface side, and a filler is further filled in the hole portion. Therefore, it will be constructed from inside the box culvert.
Therefore, during construction, train cars and automobiles cannot pass, so construction time is limited. This necessitates construction hours at night, which increases the number of times equipment is loaded, prepared, and withdrawn, and construction efficiency is significantly reduced.
In addition, since the shear reinforcement material extends in the thickness direction of the inner wall of the box culvert, it is difficult to cover the shear failure line in various directions assumed at the time of an earthquake. There are disadvantages.
This invention is made | formed in view of such a situation, The objective is to provide the reinforcement method of a concrete structure advantageous in ensuring reinforcement performance, improving construction efficiency.

In order to achieve the above-mentioned object, the present invention has a wall portion made of reinforced concrete having an elongated cross-sectional shape in the vertical direction and extending in the horizontal direction, and one surface in the thickness direction of the wall portion is A method of reinforcing a concrete structure embedded in the ground, wherein the wall portion is exposed so as to expose a plurality of locations spaced in the extending direction of the wall portion on the one surface of the wall portion. A hole excavation step of excavating a working hole extending in the vertical direction along the one surface; and the inside of the wall and the outside of the wall at the plurality of locations in the working hole. A bar arrangement step of arranging a plurality of anchor bars at intervals from the upper end to the lower end of the one surface, and a plurality of bar bars exposed to the outside of the wall portion at the plurality of positions in the working hole portion, respectively. A mold in which a concrete mold is assembled so as to surround the anchor bar An assembling step, and a reinforcing column integrally coupled to one surface of the wall portion via the anchor bar by placing concrete inside each concrete formwork in the height direction of the wall portion. And a concrete placing process that is constructed over the entire length.
Further, the present invention has a wall portion made of reinforced concrete having an elongated cross-sectional shape in the vertical direction and extending in the horizontal direction, and the wall portion has reinforcing bars embedded on both sides in the thickness direction. The one surface in the thickness direction of the wall portion is a method for reinforcing a concrete structure embedded in the ground, and the one surface of the wall portion is spaced in the extending direction of the wall portion. A hole excavation step for excavating a work hole extending in the vertical direction along the one surface of the wall so as to expose a plurality of positions; and the plurality of positions in the work hole A drilling step of drilling a plurality of anchor muscle holes at intervals from the upper end to the lower end of the one surface of the wall portion, and a plurality of anchor muscles projecting from the side surface in the working hole portion Suspend the precast concrete reinforced support pillars, A plurality of holes for anchor muscles are inserted into the wall portion with a filler, and mortar is filled between the one surface and the side surface, and the reinforcing struts are extended in the height direction of the wall portion. And a reinforcing strut joining process constructed over the entire area.

According to the present invention, along one surface of the wall portion, the plurality of portions spaced in the extending direction of the wall portion are exposed on one surface of the wall portion of the concrete structure embedded in the ground. The hole excavation process for excavating the work hole extending in the vertical direction is performed, and in the work hole, the rebar placement process and the mold framing process are performed, and concrete is placed from the ground on one side of the wall. The process was carried out to reinforce the concrete structure by constructing reinforcement posts on the wall.
Further, according to the present invention, the vertical direction along one surface of the wall portion is such that a plurality of locations spaced in the extending direction of the wall portion are exposed on one surface of the wall portion embedded in the ground. The hole drilling process for drilling the working hole extending in the direction is performed, the drilling process and the reinforcing column coupling process are performed in the working hole, and the reinforcement column made of precast concrete is built on the wall The structure was reinforced.
Therefore, when reinforcing a concrete structure, it is sufficient to secure a working space on the side and upper side of the wall, so the reinforcement work can be completed without impairing the functions of the concrete structure, for example, the functions of the road and railway. it can.
Moreover, since the extending direction of the reinforcing column is a vertical direction, it is advantageous in covering the shear fracture line in various directions assumed at the time of an earthquake, and it is advantageous in securing the reinforcing performance of the concrete structure.

It is explanatory drawing of the reinforcement method of the underground tunnel 2 in 1st Embodiment. It is a perspective view of the perspective view of the box culvert 10 which comprises the underground tunnel 2 reinforced with the reinforcement support | pillar 30. FIG. It is explanatory drawing of the reinforcement method of the underground tunnel 2 in 1st Embodiment, (A) is explanatory drawing which shows a hole excavation process, (B) is explanatory drawing which shows a bar arrangement process and a formwork attaching process, (C) is explanatory drawing which shows a concrete placement process. It is explanatory drawing of the reinforcement method of the underground tunnel 2 in 2nd Embodiment, (A) is explanatory drawing which shows a hole excavation process, (B) is explanatory drawing which shows a bar arrangement process and a formwork attaching process, (C) is explanatory drawing which shows a concrete placement process. It is explanatory drawing of the reinforcement method of the underground tunnel 2 in 3rd Embodiment, (A) is explanatory drawing which shows a hole excavation process, (B) is explanatory drawing which shows a bar arrangement process and a formwork attaching process, (C) is explanatory drawing which shows a concrete placement process. It is explanatory drawing of the reinforcement method of the underground tunnel 2 in 4th Embodiment, (A) is explanatory drawing which shows a hole excavation process and a drilling process, (B), (C) shows a reinforcement support | pillar coupling | bonding process. It is explanatory drawing. It is explanatory drawing of the reinforcement method of the digging split road 4 in 5th Embodiment. FIG. 3 is a perspective view showing a digging road 4 reinforced by reinforcing columns 30. It is explanatory drawing of the reinforcement method of the retaining wall 6 in 6th Embodiment. FIG. 5 is a perspective view showing a retaining wall 6 reinforced by a reinforcing column 30. It is explanatory drawing of the reinforcement method of the bridge abutment 8 in 7th Embodiment. FIG. 6 is a perspective view showing a bridge abutment 8 reinforced by a reinforcing column 30.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, in the first embodiment, a concrete structure is an underground for a railway constructed by being buried in the ground with a number of box culverts 10 connected in the axial direction. The case of the tunnel 2 will be described.
First, the box culvert 10 will be described.
A large number of box culverts 10 are buried in the ground in a state where they are connected in the axial direction, thereby forming an underground tunnel 2 for railway.
The internal space of the underground tunnel 2 composed of a large number of box culverts 10 is divided into two spaces, and the railway vehicle A is configured to travel in each space.
In the figure, symbol H indicates a road for an automobile provided on the ground located above the box culvert 10, and symbol B indicates an automobile traveling on the road H.

Each box culvert 10 includes a rectangular plate-shaped bottom wall 12, two side walls 14 rising from both ends in the width direction of the bottom wall 12, and a partition wall standing from the center in the width direction of the bottom wall 12 and parallel to the two side walls 14. 16 and a rectangular plate-like ceiling wall 18 connecting the two side walls 14 and the upper end of the partition wall 16.
And the two side walls 14 and the partition 16 comprise the wall part which has an elongate cross-sectional shape in the perpendicular direction, and extends in a horizontal direction.
Moreover, one surface 14A in the thickness direction of each side wall 14 is embedded in the ground, and the other surface 14B faces the internal space.
As shown in FIG. 3A, a reinforcing bar 20 is embedded in the side wall 14, and the reinforcing bar 20 located on the one surface 14A side is shown in the drawing. The reinforcing bars 20 are configured, for example, by arranging a plurality of vertical bars 20V extending in the vertical direction and a plurality of horizontal bars 20H extending in the horizontal direction in a lattice pattern.
The bottom wall 12, the side wall 14, the partition wall 16, and the ceiling wall 18 are integrally formed of reinforced concrete.
The partition wall 16 divides the internal space of the underground tunnel 2 into two spaces, and a rail R for running a railway vehicle is laid on the bottom wall 12.

Next, a method for reinforcing the box culvert 10 constituting such an underground tunnel 2 will be described.
First, as shown in FIG. 3 (A), one side of the side wall 14 is exposed so that a plurality of portions spaced in the extending direction of the side wall 14 are exposed on one surface 14A of the side wall 14 embedded in the ground. The working hole 22 extending in the vertical direction along the surface 14A is excavated (hole excavation process).
As shown in FIG. 1, excavation of the working hole 22 is performed from the ground corresponding to just above the two side walls 14 by using a construction machine 24 such as a back-for and a hammer grab, or by manual digging.
The working hole 22 may be provided at each of the plurality of locations, or may be extended in the horizontal direction so as to expose the plurality of locations simultaneously.

Next, concrete, such as a concrete hammer or a water jet cutting device, roughens the surface of the one surface 14A using a lifting device. By performing such roughening, strengthening of the connection between the concrete for constructing a reinforcing column 30 described later and the one surface 14A is achieved.
Then, after drilling a plurality of anchor muscle holes 15 at intervals from the upper end to the lower end of one surface 14A of the side wall 14 at the plurality of locations in the work hole 22, the inside of the side wall 14 at the plurality of locations. A plurality of anchor bars 26 are arranged at intervals from the upper end to the lower end of one surface 14A so as to extend to the outside of the side wall 14 (bar arrangement process). The anchor muscle 26 is inserted into the anchor muscle hole 15 and joined to the side wall 14 with a filler.
In the present embodiment, as shown in FIG. 3 (B), in the bar arranging step, the reinforcing bar 28 for the reinforcing column is assembled by being coupled to the anchor bar 26.
The strut reinforcing bar 28 includes a plurality of main reinforcing bars 28A extending in the vertical direction and a plurality of band reinforcing bars 28B surrounding the main reinforcing bars 28A.
Then, the portion of the reinforcing bar 28 for the column is joined to the portion of the anchor bar 26 exposed to the outside of the side wall 14.
For this connection, for example, a binding wire (wire) may be used, or welding may be used.
In this way, it is more advantageous to firmly connect the reinforcing column 30 to the side wall 14 by connecting the column reinforcing bar 28 to the anchor bar 26 arranged on the side wall 14.

Next, as shown in FIG. 3 (B), a concrete mold is formed so as to surround a plurality of anchor bars 26 and strut reinforcing bars 28 exposed to the outside of the side wall 14 at the plurality of locations in the work hole 22. A frame 32 is assembled (molding process).
More specifically, the concrete formwork 32 is assembled so as to partition the space extending over the entire length in the height direction of the side wall 14 so as to surround the plurality of anchor bars 26 and the support reinforcing bars 28 exposed to the outside of the side wall 14. .
The space portion has a rectangular parallelepiped shape with a substantially rectangular cross section and extending vertically.

Next, as shown in FIG. 3 (C), by reinforcing concrete 34 inside each concrete formwork 32, the reinforcement integrally joined to one surface 14A of the side wall 14 via an anchor bar 26 is provided. The support column 30 is constructed over the entire length in the height direction of the side wall 14 (concrete placing step). In the present embodiment, the reinforcing column 30 is constituted by a reinforced concrete column (RC column).
FIG. 2 shows a perspective view of the box culvert 10 constituting the underground tunnel 2 reinforced by the reinforcing column 30.
In addition, after the concrete 34 is hardened, the concrete mold 32 may be removed or left as it is, and FIG. 3C shows a state in which the concrete mold 32 is removed.

As described above, according to the present embodiment, a plurality of locations spaced in the extending direction of the side wall 14 are exposed on one surface 14A of the side wall 14 of the box culvert 10 embedded in the ground. The hole excavation step for excavating the work hole portion 22 extending in the vertical direction along one surface of the side wall 14 is performed, and the bar arrangement process and the mold frame attaching step are performed in the work hole portion 22. A concrete placing process was performed from the ground on one surface 14A of the side wall 14, and the underground tunnel 2 was reinforced by constructing the reinforcing support 30 on the side wall 14.
Therefore, it is not necessary to construct from the inside of the underground tunnel 2, and it is sufficient to secure a working space on the side and above the side wall 14, so that the reinforcement of the underground tunnel 2 can be performed while operating the vehicle in the same manner as in the past. Reinforcement work can be completed without impairing the function of the engine.
Further, since the reinforcement work can be performed while operating the vehicle as in the conventional case, the construction is not limited to the night when the vehicle does not travel, and can be performed during the day, which is advantageous in improving the construction efficiency.

Further, the anchor bars 26 function so that the reinforcing struts 30 are transmitted from the side walls without being peeled off so that the reinforcing struts 30 and the side walls 14 work as one body, so that the reinforcing performance of the underground tunnel 2 is ensured. This is advantageous.
Further, in constructing the reinforcing support 30, it is only necessary to drill a plurality of anchor muscle holes 15 for arranging the anchor bars 26 on one surface 14 </ b> A of the side wall 14, so that the damage to the side walls 14 is minimized. This is advantageous in securing the reinforcing performance of the underground tunnel 2.

In addition, since the extending direction of the reinforcing column 30 is a vertical direction, it is advantageous in covering the shear fracture line in various directions assumed at the time of the earthquake, and advantageous in securing the reinforcing performance of the underground tunnel 2. .
For example, when the shear fracture line extends in the thickness direction of the side wall 14, in the related art, the reinforcing member extends in the thickness direction of the side wall 14, and therefore, the extending direction of the reinforcing member and the shear fracture line hardly cross each other. The reinforcing member becomes difficult to function.
On the other hand, in the present invention, since the reinforcing column 30 extends in the vertical direction of the side wall 14, the extending direction of the reinforcing column 30 and the shear fracture line are surely crossed, and the reinforcing column 30 is easy to function. Become.
Further, in the prior art, because of the configuration in which the reinforcing member extends in the thickness direction of the side wall 14, the toughness reinforcement is the main effect especially as the shear reinforcement of the side wall 14, and the effect of bending reinforcement is not achieved.
On the other hand, in the present invention, since the reinforcing support 30 extends in the vertical direction of the side wall 14, it is advantageous in providing the effect of bending reinforcement as shear reinforcement of the side wall 14.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS.
In the following embodiments, the same members and portions as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.
As shown in FIGS. 4A to 4C, the second embodiment is different from the first embodiment in that the reinforcing support 30 is formed of a steel concrete column.

First, as shown in FIG. 4A, the work hole 22 is excavated (hole excavation process) as in the first embodiment.
Then, after roughening the surface of the one surface 14A of the side wall 14 in the work hole 22 in the same manner as in the first embodiment, a plurality of anchor bars 26 are placed in one of the work holes 22 in the work hole 22. A plurality of bars are arranged at intervals from the upper end to the lower end of the surface 14A (bar arrangement process). In this case, a male thread portion is formed at the tip of the anchor muscle 26 exposed to the outside of the side wall 14.
In the second embodiment, as shown in FIG. 4 (B), in the bar arranging step, the H-shaped steel 36 for reinforcing columns is assembled by being coupled to the anchor bars 26.
The H-shaped steel 36 has flanges 3604 on both sides of the web 3602, and one flange 3604 is formed with a hole (not shown) through which the male thread portion 2602 of the anchor bar 26 is inserted.
The H-shaped steel 36 is suspended from the working hole 22 with the flange 3604 facing the one surface 14A and the longitudinal direction thereof being vertical, and the male thread portion 2602 of the anchor bar 26 is inserted into the hole of the flange 3202. Then, it is fastened to the flange 3602 by being screwed to the nut 38.
In the second embodiment, the H-shaped steel 36 is fastened to the anchor bar 26 with a space between one flange 3604 and one surface 14A of the side wall 14.
When the flange 3604 of the H-shaped steel 36 is coupled to the anchor bar 26 arranged on the side wall 14 in this way, it is more advantageous in firmly integrating the reinforcing column 30 to the side wall 14.

Next, as shown in FIG. 4 (B), a concrete formwork is formed so as to surround a plurality of anchor bars 26 and H-shaped steel 36 exposed to the outside of the side wall 14 at the plurality of locations in the work hole 22. 32 is assembled (molding process).
More specifically, the concrete formwork 32 is assembled so as to partition the space extending over the entire length in the height direction of the side wall 14 by surrounding the plurality of anchor bars 26 and the H-shaped steel 36 exposed to the outside of the side wall 14.
The space portion has a rectangular parallelepiped shape with a substantially rectangular cross section and extending vertically.

Next, as shown in FIG. 4C, a concrete placing step similar to that of the first embodiment is performed.
The concrete mold 32 may be removed or left as it is after the concrete 34 is hardened, as in the first embodiment.
According to the second embodiment, in addition to the operational effects of the first embodiment, the reinforcing support 30 is composed of a steel concrete column using the H-shaped steel 36, and therefore when reinforcing reinforcing bars are arranged. In comparison, it is advantageous in simplifying the bar arrangement process.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS.
The third embodiment is a modification of the second embodiment, and only the arrangement of the H-shaped steel 36 is different from the second embodiment.
That is, as shown in FIG. 5 (B), in the second embodiment, in the reinforcing step, the H-shaped steel 36 makes one flange 3604 abut against one surface 14 of the side wall 14 and anchor bars 26. It is concluded to.
In addition, as shown to FIG. 5 (A) and (C), a hole excavation process, a mold-frame attachment process, and a concrete placement process are the same as that of 2nd Embodiment.
Also in the third embodiment, the same effects as those of the second embodiment can be obtained, and it is advantageous in reducing the size of the reinforcing column 30 in the web 3602 direction of the H-shaped steel 36.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS.
The fourth embodiment is different from the first to third embodiments in that a reinforcing column 40 made of precast concrete is coupled to the side wall 14.

First, as shown in FIG. 6 (A), one side of the side wall 14 is exposed so that a plurality of portions spaced in the extending direction of the side wall 14 are exposed on one side 14A of the side wall 14 embedded in the ground. The working hole 22 extending in the vertical direction along the surface 14A is excavated (hole excavation process).
Next, as in the first embodiment, the surface of one surface 14 </ b> A of the side wall 14 is roughened in the working hole 22. By performing such roughening, strengthening of the connection between the one surface 14A and the reinforcing support column 40 by a mortar 46 described later is achieved.

  Next, a plurality of anchor muscle holes 15 are drilled at intervals from the upper end to the lower end of one surface 14A of the side wall 14 at a plurality of locations in the working hole 22 (a drilling step).

Next, the reinforcing column 40 made of precast concrete is suspended in the working hole 22 and coupled to the side wall 14 (reinforcing column coupling step).
That is, the reinforcing support column 40 has a quadrangular prism shape and includes a support reinforcing bar 42 and a plurality of anchor bars.
The strut reinforcing bar 42 includes a plurality of main bars 42A extending in the longitudinal direction of the reinforcing column 40 and a plurality of band bars 42B surrounding the main bars 42A.
The plurality of anchor bars 44 are coupled to the supporting bar 42 and protrude from one side surface 4002 at intervals in the longitudinal direction of the reinforcing column 40.
In the reinforcing strut coupling step, after the reinforcing struts 40 are suspended, each anchor bar 44 is inserted into the plurality of anchor bar holes 15 and coupled to the side wall 14 with a filler, and the reinforcing struts 40 are connected to the side wall 14 in the height direction. Build over.
Further, when the anchor bar 44 is inserted into the plurality of anchor bar holes 15 and joined to the side wall 14 with the filler, one side surface 4002 of the reinforcing column 40 is opposed to the one side 14A of the side wall 14 and the space between these surfaces is made. Is filled with mortar 46.

  Next, after the mortar 46 is hardened, earth and sand are backfilled in the gap between the reinforcing column 40 and the working hole 22, and the side wall 14 and the reinforcing column 40 are embedded in the ground to complete the operation.

According to the fourth embodiment, one surface 14A of the side wall 14 is exposed such that a plurality of positions spaced in the extending direction of the side wall 14 are exposed on one surface 14A of the side wall 14 embedded in the ground. A hole excavation step for excavating the work hole portion 22 extending in the vertical direction is performed, and a drilling step and a reinforcing column connection step are performed in the work hole portion 22 to reinforce the side wall 14 made of precast concrete. The underground tunnel 2 was reinforced by constructing the support column 40.
Therefore, in addition to the effects of the first embodiment, since the precast concrete reinforcing strut 40 is used, the frame forming step and the concrete placing step can be omitted, which is advantageous in shortening the construction period and reducing the cost. It becomes.

(Fifth embodiment)
Next, a fifth embodiment will be described.
As shown in FIG. 7, in the fifth embodiment, a case where the concrete structure is a digging road 4 will be described.
The moat split road 4 is constructed by cast-in-place concrete or a precast member in a groove excavated in the ground G.
As shown in FIGS. 7 and 8, the moat split road 4 includes a bottom wall 50 constituting a roadbed, and two side walls 52 erected from both ends in the width direction of the bottom wall 50. The outer surface of 52 is embedded.
The two side walls 52 constitute a wall portion having an elongated cross-sectional shape in the vertical direction and extending in the horizontal direction.
The bottom wall 50 and the side wall 52 are integrally formed of reinforced concrete.

Next, a method for reinforcing the digging road 4 will be described with reference to FIGS.
As shown in FIG. 3A, as in the first embodiment, a plurality of locations spaced in the extending direction of the side wall 52 are exposed on one surface 52A of the side wall 52 embedded in the ground. As described above, the working hole 22 extending in the vertical direction along the one surface 52A of the side wall 52 is excavated (hole excavation step).

Next, the surface of one surface 52A of the side wall 52 is roughened in the working hole 22, and a plurality of anchor bars are spaced from the upper end to the lower end of the one surface 52A of the side wall 52 at the plurality of locations. After drilling the use hole 15, a plurality of anchor bars 26 are arranged at intervals from the upper end to the lower end of one surface 52A so as to extend to the inside of the side wall 52 and the outside of the side wall 52 at the plurality of locations (bar arrangement). Process). The anchor muscle 26 is inserted into the anchor muscle hole 15 and joined to the side wall 52 with a filler.
Further, in the bar arrangement process, the reinforcing bar 28 for the reinforcing column is assembled by being coupled to the anchor bar 26.

  Next, as shown in FIG. 3 (B), a concrete mold is formed so as to surround a plurality of anchor bars 26 and strut reinforcing bars 28 exposed to the outside of the side wall 52 at the plurality of locations in the work hole 22. A frame 32 is assembled (molding process).

Next, as shown in FIG. 3 (C), the concrete 34 is placed inside each concrete formwork 32 so as to be integrally coupled to one surface 52A of the side wall 52 via the anchor bars 26. The support column 30 is constructed over the entire length in the height direction of the side wall 52 (concrete placing step).
FIG. 8 shows a perspective view of the digging road 4 reinforced by the reinforcing columns 30.
Of course, as in the second and third embodiments, it is possible to use the reinforcing struts 30 made of steel concrete columns.

According to the fifth embodiment, the side wall 52 of the side wall 52 is exposed so as to expose a plurality of locations spaced in the extending direction of the side wall 52 on one surface 52A of the side wall 52 of the moat split road 4 buried in the ground. A hole excavation process for excavating the work hole 22 extending in the vertical direction along the one surface 52A is performed, and a bar arrangement process and a mold forming process are performed in the work hole 22, and the side wall 52 The concrete placing process was performed from the ground of one surface 52A, and the reinforcing column 30 was constructed on the side wall 52, whereby the moat split road 4 was reinforced.
Therefore, it is sufficient to secure a working space on the side and the upper side of the side wall 52, and it is not necessary to construct from the inner side of the moat split road 4, that is, from the roadway side. The reinforcement work of the Horiwari road 4 can be performed without restricting the above, and the reinforcement work can be completed without impairing the function of the transportation system.
In addition, since the reinforcement work can be performed without restricting the traffic of the vehicle, the construction is not limited to the night when the vehicle travels less and can be performed during the day, which is advantageous in improving the construction efficiency.
Moreover, since the extending direction of the reinforcing column 30 is the vertical direction as in the first embodiment, it is advantageous in covering the shear fracture lines in various directions assumed at the time of the earthquake. This is advantageous for securing the reinforcing performance.

In addition, as in the fourth embodiment, it is a matter of course that a reinforcing column 40 made of precast concrete may be constructed instead of the reinforcing column 30.
In that case, along one surface 52A of the side wall 52 so that a plurality of positions spaced in the extending direction of the side wall 52 are exposed on one surface 52A of the side wall 52 of the moat split road 4 buried in the ground. Then, a hole excavation step for excavating the work hole portion 22 extending in the vertical direction is performed, a drilling step and a reinforcing column coupling step are performed in the work hole portion 22, and the reinforcing column 40 made of precast concrete is formed on the side wall 52. It is only necessary to reinforce the moat split road 4 by constructing, and the same effects as described above can be obtained.

(Sixth embodiment)
Next, a sixth embodiment will be described.
As shown in FIG. 9, in the sixth embodiment, a case where the concrete structure is a retaining wall 6 will be described.
As shown in FIGS. 9 and 10, the retaining wall 6 includes a rectangular plate-like floor slab 54 and a vertical wall 56 erected from one side of the floor slab 54, and has an L-shaped cross section.
The vertical wall 56 constitutes a wall portion having an elongated cross-sectional shape in the vertical direction and extending in the horizontal direction.
The floor slab 54 and the vertical wall 56 are integrally formed of reinforced concrete.
Filling is performed on the upper surface of the floor slab 54 of the retaining wall 6 and the rear surface of the vertical wall 56.
The retaining wall 6 is constructed by cast-in-place concrete, or is constructed by arranging precast members.
In the figure, reference numeral 60 denotes an automobile road or a railroad track provided in front of the vertical wall 56.

Next, a method for reinforcing the retaining wall 6 will be described with reference to FIGS.
As shown in FIG. 3 (A), as in the first embodiment, a plurality of locations spaced in the extending direction of the vertical wall 56 on one surface 56A of the vertical wall 56 embedded in the ground. The working hole 22 extending in the vertical direction along one surface 56A of the vertical wall 56 is excavated so as to be exposed (hole excavation process).

Next, in the working hole 22, the surface of one surface 56A of the vertical wall 56 is roughened, and a plurality of spaces are provided from the upper end to the lower end of the one surface 56A of the vertical wall 56 at the plurality of locations. After drilling the anchor muscle hole 15, the anchor bars 26 are arranged at intervals from the upper end to the lower end of one surface 56A so as to extend inside the vertical wall 56 and outside the vertical wall 56 at the plurality of locations. (Reinforcement process) The anchor muscle 26 is inserted into the anchor muscle hole 15 and joined to the vertical wall 56 with a filler.
Further, in the bar arrangement process, the reinforcing bar 28 for the reinforcing column is assembled by being coupled to the anchor bar 26.

  Next, as shown in FIG. 3 (B), the concrete is formed so as to surround the plurality of anchor bars 26 and the column reinforcing bars 28 exposed to the outside of the vertical wall 56 at the plurality of locations in the work hole 22. The formwork 32 is assembled (formwork attaching process).

Next, as shown in FIG. 3 (C), concrete 34 was placed inside each concrete formwork 32 to be integrally coupled to one surface 56A of the vertical wall 56 via an anchor bar 26. The reinforcing column 30 is constructed over the entire length in the height direction of the vertical wall 56 (concrete placing step).
FIG. 10 shows a perspective view of the retaining wall 6 reinforced by the reinforcing column 30.
Of course, as in the second and third embodiments, it is possible to use the reinforcing struts 30 made of steel concrete columns.

According to the sixth embodiment, the vertical surface 56A of the retaining wall 6 embedded in the ground is vertically exposed so as to expose a plurality of locations spaced in the extending direction of the longitudinal wall 56. A hole excavation process for excavating the work hole 22 extending in the vertical direction along one surface 56A of the wall 56 is performed, and a bar arrangement process and a mold frame attaching process are performed in the work hole 22; The concrete placing process was performed from the ground surface of one side 52 </ b> A of the side wall 52, and the retaining wall 6 was reinforced by constructing the reinforcing column 30 on the side wall 52.
Accordingly, it is sufficient to secure a working space on the side and upper side of the vertical wall 56, and it is not necessary to construct the work from the front of the vertical wall 56, that is, from the side of the automobile road (railway track) 60. Similarly to the form, the reinforcement work of the retaining wall 6 can be performed without restricting the passage of the vehicle, and the reinforcement work can be completed without impairing the function of the transportation facility.
In addition, since the reinforcement work can be performed without restricting the traffic of the vehicle, the construction is not limited to the night when the vehicle travels less and can be performed during the day, which is advantageous in improving the construction efficiency.
Moreover, since the extending direction of the reinforcing column 30 is the vertical direction as in the first embodiment, it is advantageous in covering the shear fracture lines in various directions assumed at the time of the earthquake. This is advantageous for securing the reinforcing performance.

In addition, as in the fourth embodiment, it is a matter of course that a reinforcing column 40 made of precast concrete may be constructed instead of the reinforcing column 30.
In that case, one surface of the vertical wall 56 is exposed so that a plurality of portions spaced in the extending direction of the vertical wall 56 are exposed on one surface 56A of the vertical wall 56 of the retaining wall 6 embedded in the ground. A hole excavation process for excavating the work hole 22 extending in the vertical direction along 56A is performed, and a drilling process and a reinforcing column connection process are performed in the work hole 22, and the vertical wall 56 is made of precast concrete. It is only necessary to reinforce the retaining wall 6 by constructing the reinforcing struts 40, and the same effects as described above can be obtained.

(Seventh embodiment)
Next, a seventh embodiment will be described.
As shown in FIG. 11, in the seventh embodiment, a case where the concrete structure is a bridge abut 8 will be described.
As shown in FIGS. 11 and 12, the bridge abutment 8 constitutes a part of the bridge 9 on which the automobile travels, and includes an abutment frame 60 and an abutment wall portion 62.
The abutment housing 60 has a height and a width extending in the width direction of the bridge 9.
Filling is performed on the back of the abutment housing 60.
A seat surface 6002 on which an end portion of the bridge beam 64 is installed is formed on the upper part of the abutment housing 60, and the abutment wall portion 62 is erected from a position adjacent to the seat surface 6002, and the upper end surface 6202 of the abutment wall portion 62. Is substantially the same height as the upper surface of the bridge girder 64.
The abutment wall portion 62 has a wall portion extending in the horizontal direction and having an elongated cross-sectional shape in the vertical direction.
The back surfaces of the abutment housing 60 and the abutment wall portion 62 are covered with embankment.

Next, a method for reinforcing such a bridge abut 8 will be described with reference to FIGS. 3 (A) to 3 (C).
As shown in FIG. 3 (A), as in the first embodiment, a plurality of intervals are provided in the extending direction of the abutment wall portion 62 on one surface 62A of the abutment wall portion 62 embedded in the ground. The working hole 22 extending in the vertical direction along the one surface 62A of the abutment wall 62 is excavated so as to expose the location (hole excavation step).

Next, the surface of the one surface 62A of the abutment wall portion 62 is roughened in the working hole 22, and the plurality of places are spaced from the upper end to the lower end of the one surface 62A of the abutment wall portion 62. After drilling a plurality of anchor muscle holes 15, the anchor bars 26 are spaced from the upper end to the lower end of one surface 62A so as to extend inside the abutment wall 62 and outside the abutment wall 62 at the plurality of locations. Multiple placements (placement process). The anchor muscles 26 are inserted into the anchor muscle holes 15 and joined to the abutment wall portion 62 with a filler.
Further, in the bar arrangement process, the reinforcing bar 28 for the reinforcing column is assembled by being coupled to the anchor bar 26.

  Next, as shown in FIG. 3B, a plurality of anchor bars 26 and support bars 28 exposed to the outside of the abutment wall part 62 are surrounded in the work hole 22 at the plurality of positions, respectively. The concrete formwork 32 is assembled (formwork attaching process).

Next, as shown in FIG. 3 (C), concrete 34 is placed inside each concrete formwork 32 so as to be integrally connected to one surface 62A of the abutment wall portion 62 via the anchor bars 26. The reinforcing strut 30 is constructed over the entire length of the abutment wall 62 in the height direction (concrete placing step).
FIG. 12 shows a perspective view of the bridge abutment 8 reinforced by the reinforcing column 30.
Of course, as in the second and third embodiments, it is possible to use the reinforcing struts 30 made of steel concrete columns.

According to the seventh embodiment, the one surface 62A of the abutment wall portion 62 of the bridge abut 8 embedded in the ground is exposed at a plurality of locations spaced in the extending direction of the abutment wall portion 62. Then, a hole excavation process for excavating the work hole 22 extending in the vertical direction along one surface 62A of the abutment wall 62 is performed, and a bar arrangement process and a formwork attaching process are performed in the work hole 22. The concrete abutment process was performed from the ground surface of one surface 62A of the abutment wall portion 62, and the reinforcing column 30 was constructed on the abutment wall portion 62, so that the bridge abutment 8 was reinforced.
Therefore, when the bridge 9 has a plurality of lanes, only the portion of the abutment wall portion 62 corresponding to a part of the lane of the abutment wall portion 62 is subjected to traffic restriction, and the remaining lane is restricted. If not, the reinforcement work can be completed without impairing the function of transportation.
In addition, since the reinforcement work of the bridge abutment 8 can be performed without completely prohibiting the passage of vehicles, the construction is not limited to the night when the vehicle travels less and can be performed even during the day, improving the construction efficiency. This is advantageous.
Further, as in the first embodiment, the extending direction of the reinforcing column 30 is the vertical direction, which is advantageous in covering the shear fracture lines in various directions assumed at the time of the earthquake. This is advantageous for securing the reinforcing performance.

Also in the seventh embodiment, as in the fourth embodiment, it is a matter of course that a precast concrete reinforcing column 40 may be constructed instead of the reinforcing column 30.
In that case, one surface 62A of the abutment wall portion 62 is exposed such that a plurality of positions spaced in the extending direction of the abutment wall portion 62 are exposed on one surface 62A of the abutment wall portion 62 embedded in the ground. A hole excavation step for excavating the work hole portion 22 extending in the vertical direction is performed, and a drilling step and a reinforcing column connection step are performed in the work hole portion 22, and the abutment wall portion 62 is made of precast concrete. It is only necessary to reinforce the bridge abutment 8 by constructing the reinforcing strut 40, and the same effects as described above can be obtained.

  2 ... Underground tunnel, 4 ... Digging road, 6 ... Retaining wall, 8 ... Bridge abut, 9 ... Bridge, 10 ... Box culvert, 12 ... Bottom wall, 14 ... Side wall, 14 ... One side 15 ... Anchor hole, 22 ... Work hole, 26 ... Anchor bar, 28 ... Reinforcing bar, 30 ... Reinforcing bar, 32 ... Concrete formwork, 34 ... Concrete, 36 …… H-shaped steel, 3602 …… Flange, 38 …… Nut, 40 …… Reinforcing column made of precast concrete, 4002 …… One side, 44 …… Anchor bar, 46 …… Mortar, 52 …… Side wall, 52A: one surface, 56: vertical wall, 56A: one surface, 62: abutment, 62A: one surface.

Claims (6)

Reinforcement of a concrete structure having a wall section made of reinforced concrete having an elongated cross-sectional shape in the vertical direction and extending in the horizontal direction, and one surface in the thickness direction of the wall section being buried in the ground A method,
A working hole extending in the vertical direction along the one surface of the wall so as to expose a plurality of locations spaced in the extending direction of the wall on the one surface of the wall. Hole drilling process for drilling, and
A bar arrangement process in which a plurality of anchor bars are arranged at intervals from the upper end to the lower end of the one surface so as to span the inside of the wall part and the outside of the wall part at the plurality of locations in the working hole. When,
In the working hole, a mold framing step of assembling a concrete mold so as to surround the plurality of anchor bars exposed to the outside of the wall at the plurality of locations,
Reinforcing struts integrally connected to one surface of the wall portion via the anchor bars are constructed over the entire length in the height direction of the wall portion by placing concrete inside each concrete formwork. Concrete placing process;
A method for reinforcing a concrete structure, comprising: In the bar arrangement step, the reinforcing bar for the reinforcing column is assembled to be coupled to the anchor bar,
In the formwork attaching step, a concrete formwork is assembled so as to surround the reinforcing bar for the column in addition to the anchor bars,
The reinforcing column is a reinforced concrete column,
The method for reinforcing a concrete structure according to claim 1. In the bar arrangement step, the H-shaped steel is suspended in the working hole portion with the longitudinal direction thereof in the vertical direction with the flange facing the one surface,
The anchor bar is inserted into the hole of the flange and fastened to the flange with a nut,
In the formwork attaching step, a concrete formwork is assembled so as to surround the H-shaped steel in addition to the anchor bars,
The reinforcing column is a steel concrete column,
The method for reinforcing a concrete structure according to claim 1. The flange is in contact with the one surface;
The method for reinforcing a concrete structure according to claim 3. In the bar arrangement process, roughening is performed on the one surface.
The method for reinforcing a concrete structure according to any one of claims 1 to 3, wherein: A wall portion made of reinforced concrete having an elongated cross-sectional shape in the vertical direction and extending in the horizontal direction, the wall portion having reinforcing bars embedded on both sides in the thickness direction, and the wall portion One surface in the thickness direction of the is a method of reinforcing a concrete structure embedded in the ground,
A working hole extending in the vertical direction along the one surface of the wall so as to expose a plurality of locations spaced in the extending direction of the wall on the one surface of the wall. Hole drilling process for drilling, and
In the working hole, a drilling step of drilling a plurality of anchor muscle holes at an interval from the upper end to the lower end of the one surface of the wall at the plurality of locations;
A reinforcing column made of precast concrete in which a plurality of anchor bars project from the side surface is suspended in the working hole, and each anchor bar is inserted into the plurality of anchor bars and filled with a filler in the wall. A reinforcing strut combining step of combining and filling mortar between the one side and the side surface and constructing the reinforcing strut over the entire length in the height direction of the wall;
A method for reinforcing a concrete structure, comprising:

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